Jack



S. H. LANYON.

JACK.

APPLICATION FILED OCT. l5. 1919.

Patented Nov. 22, 1921.

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adotmuf S. H. LANYON.

JACK.

APPLlcATxoN FILED ocT.15. 1919.

1,397,594 PatenteaNov. 22,1921.

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` JACK. APPLICATION FILED OCT-15, 1919.

- Patented Nov. 22, 1921.

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UNITED STATES SAMUEL HERBERT LANYON, OF OAKLAND, CALIFORNIA.

JACK.

Application led October 15, 1919.

To @ZZ whom t may concern Be it known that I, SAMUEL HERBERT LAN- roN, a subject ot' the King ot Great Britain and Ireland, residing at Oakland, in the county of Alameda and State of California7 have invented certain new and useful .Improvements in Jacks, ot' which the following is a specification, reference being had therein to the accompanying drawings.

T he invention relates to jacks and the object ot' the invention is to obtain a construction in which the operating mechanism is controlled solely by the movement ot' the handle lever independent ot' any projection or am which is adjustable to control the raising or lowering oi the lifting bar. An-

;other object of the invention is to obtain a construction in which the moving pawl is movable over a range ot several notches in the lifting bar and its engagement with a notch is dependent` upon the angulal position of the lever. A further object of the invention is to obtain a construction in which the holding and moving pawls are automatially vieldabljr disengaged from and engaged with the notches ot' the lifting bar. A still iurther object ot the invention is to obtain a simple construction which does not require accurate machining et the parts ot the operating mechanism and will operate with the jack in any position. Still other objects of the invention reside in further advantages and in the novel arrangements and combinations of parts as more tulljv hereinafter set forth.

In the drawings:

Figure l is a t'ront elevation of' the jack embodying my invention;

Figs. 2, 3, 4 and .5 are side elevations or' the jacl; showing the operating mechanism in different positions ot' adjustment;

Figs. G and 7 are cross-sections respectivelyv on the lines G-6 and 7 7 of Fig. 2;

Fig. 8 a side elevation of the jack show. ing the arc of movement of the handle;

Fig. 9 is a cross section on the line 9 9 of Fig. 2.

A is the frame having the enlargement A for housing` the operating mechanism, and B tne lifting bar having the notches B. B2, B3, Bt. B5. ete. The operating mechanism comprises the stationarj7 cam Ci the moving pawl E and the holding pawl G,

Specification of Letters Patent.

Patented Nov. 22, 1921. Serial No. 330,891.

both of the pawls being engageable with the notches in the lifting bar. The stationary cam C is secured at its opposite ends C to the enlargement A. The moving pawl E is pivotally mounted at, one end El; upon the `handle lever F, which in turn is pivoted at F upon the enlargenient A', the opposite end it oi the moving pawl being engageable with the notches in the lifting bar. As shown, the end E3 oi the moving pawl E rests in a halt-round groove in the handle lever F and the latter has check 1nieces F* upon opposite sides which are provided with aliner apertures tor receiving cylindrical projections E5 at opposite sides ot the end E3. Pivotallv mounted at E near the opposite. end lil* ot' the moving pawl is the rockbar D. there being a coil spring E2 between the pawl and bar adapted to noimally rotate the bar in a clock-wise direction. The holding pawl G is pivotally mounted at its lower end G upon the enlargement A, its upper end being` engageable with the notches in the lifting bar. The holding pawl is provided with the projection or extension G" at its upper end in which is pivotall'yv mounted at G2 the rock-arm H, there beingr a coil spring G3 between the holding` pawl and the roch-arm adapted to normally rotate the rock-arm in a clock-wise direction to maintain its lower end H2 bearing upon the abutment A2 YFormed upon the enlargement A. The roekbar D is provided with the cylinder head pins D and D2 at opposite ends adapted to respectively slide over the cam surfaces Cg andL C5 and engage the cam surfaces CA1 and C3 upon the stationary cam C. The pin D is also adapted to engage the cam surface H upon the rock-arm H.

The handle lever F has a suitable socket F2 in its outer or tree end for engagement with the handle J. which has the transverse pin J through one end J2 tor engaging the notches F3 in the outer edge ot the handle lever to permit revolving the end J2 in the socket F2 through an arc of approximately one hundred andeighty degrees. To raise the lifting bar B the handle lever is swung through the arc X-Y and to lower he lifting bar the handle lever is swung through the arc X--Z7 as more fully hereinafter described. These arcs are adjacent to each other, so that in the manipulation of the handle lever, the latter is swung through a considerable are between itsl extreme limits of movement Aand in some cases would be impracticable to operate. To overcome this objection the handle l has its end J2, which engages the handle lever socket, inclined relative to the longitudinal axis of the handle, the angle of inclination being approximately one fourth of the total angle lil-Z. ln the raising` operation the handle is engaged with the lever so that the outer end of the handle is at an angle below the horizontal or at the point Z of the arc lf3-Z and in swinging the lever through its arc X-Y the handle swings through the arc ZK-Y1. ln the lowering operation the end J2 of the handle is revolved in the socket F2 approximately one hundred and eighty degrees to be engaged with the lever so that its outer end is approximatelvpat the point Y and in the swinging of the lever through its arc l Z the handle swings through the same are Y-Z approximately. rllhe outer end of the handle .l is also adapted to be inserted into the socket F2 to permit of optional raising or loi-.vering of the lifting bar without removing the handle from the socket.

1n operation, to raise the lifting bar B, the main lever F is moved through the arc )iQ-Y and assuming both the holding and moving pawls to be respectively engaging the notches B5 and B2, as shown in F iga 2 in full lines, the irst portion of upward swinging of the handle lever F toward Y would move the moving pawl lil downward and place the load of the lifting bar D upon the holding pawl Gr. The cylindrical head of thel pin D at the upper end of the roch bar D rests against the cam surface C2 and the coil spring FF reacts upon the moving pawl E to swing the same about its pivotl in a counter clockwise direction to eject the moving pawl from its engaged notch B2, until the cylindrical head of the pin D2 at the lower end of the roch-bar engages the cam surface Ct. The end Ff* of the moving pawl now clears the teeth formed by the notches in the lifting` bar and the parts are in the position, as shown in Fig. Upon further raising of the handle lever F toward Y, the moving pawl with the rock-bar D moves downwardly and the head of the pin D2 at the lower end of the roch-bar engages the lower cam surface Ct. The coil spring E2 tending to swing the pin D at the upper end of the rock-bar in a clockwise direction forces the cylindrical head of the same toward the cam surface C2 so that the upper end E of the moving pawl is held against the contour of the teeth in the lifting bar,

which will force the end Fri to engage with the notch B', as shown in Fig. d. This notch is engaged slightly prior to or at the time the handle lever reaches its upward limit of travel at Y. Upon moving the handle lever F downward from l toward X, the moving pawl F. is moved upward and takes the load of the lifting bar. During this downward movement of the handle lever, the pivot point E of the rock-bar ascends parallel with the lifting bar B and soon after the commencement of the movement of the rochbar D the head of the pin DV impinges against the cam surface C3 and rides thereon., thereby moving the head of the pin D2 upon thel lower end of the rock-bar increasingly further away from the cam surface C4. During thge downward movement of the handle lever, the holding pawl G moves over the surface of the notch B5 and is yieldably forced into engagement with the notch Bt.

Vihen the handle lever has reached its downward limit of travel at X the parts are in the position as shown in Fig. 2, with the notch in the original position of B2 and the notch B2 in the original position of B5.

To lower the lifting bar B, the handle lever is moved through its arc lli- Z rlhe parts are assumed to be in the positions, as shown in full lines in Fig. 2, with the holding pawl in engagement with the notch B5 and the moving pawl in engagement with the notch B2. rlhe handle lever F is -first moved upward a very slight distance to place the load of the lifting bar upon the holding pawl lil when the spring F12 eject the end F14 of the moving pawl E from the notch B2 as previously described and shown in Fig. 3. rlhe handle leveris then moved downwardly, thereby raising the moving pawl l@ with the rock-bar D and forcing the head of the pin D2 at the lower end ofthe roch-bar into engagement with the cam surface C5. The coil spring F2 tends to rotate the rpin D in a clockwise direction so that the head of the pin moves along the cam surface C2, whereby the roch bar D moves bodily in a direction toward and approximately parallel with the notches in the lifting bar and the end E4 of the-moving pawl E engages the notch B3 in the liftinf` bar., as shown in Fig. 5. After the end E* of the moving pawl has engaged the notch B2, the end G5 of the holding pawl (l is disengaged from its notch B5 by the following:constructionz The head of the pin D at the upper end of the rockbar D in its upward movement engages with the cani surface H upon the rock-arm ll to rotate the same in a counter-clockwise direction, thereby removing the lower end H2 of the rock-arm from engagement with the abutment surface A2 upon the enlargement A. The spring G2 is slightly compressed by this movement and is now free to react upon the holding pawl G to rotate the same in a counter-clockwise direction to eject the end G5 thereof from engagement with the notch B5. The end G5 is ejected from the notch B5 reacts to' ills until the loiver end H2 of the rock arm engages the abutment surface Rif, the parts being in the position, as shovvn in Fig. The.

handle lever has now reached its loiver limit o' travel at Z and upon return movement from Z tovvard X, the pivot point E descends substantially parallel to the lifting bar B and the end ot the holding paivl slides into engagement u'ith the notch B6 so that ivhcn the handle lever has reached its upper limitfol travel near X, the parts are in the positions, as shovvn in full lines in Fig. 2, With the notch B in the original position of B5 and the notch B3 in the original position 0r" B2.

From the above it will be readily seen that i have obtained a simple construction in which accurate machining` oft the parts is not required and, `furthermore, the operation is controlled solely bj: the movement of the handle independent oi' any manually-controlled levers. Furthermore, the holding and moving` pavvls are yieldably disengaged from and engaged With the notches orp the lifting bar at proper times dependent upon the position ot' the moving pavfl and consequently of the handle lever.

lllhat I claim as my invention, is:

l. in a Iiacl-I. the combination with a notched lifting bar, ot holding and moving parvis, engageable ivith the notches in said bar, springs normally forcingsaid paivls into engagement ivith the notches, and means dependent upon the `position oli said moving pavvl for reversing the action of said springs to eject said paivls out of engagement ivith the noti-lies.

2. In a jack. the combination With a notched lifting bar, o't holding and moving pavls, engageable with the notches in said bar, springs independent of each other for normally forcing said paivls into engagement 'with the notches. and means dependent upon the position of said moving payvl for automaticallyY reversing the action of said springs to n'ithdraiv said paivls out of engagement v-:ith the notches.

3. ln a jack mechanism. the combination `with a standard and a notcled lifting bar slidably engaging said stand' l. of a holding paivl pivoted upon said standard and adapted to engage the notches of said bar, a lever pivoted upon said standard, a moving pavl cngageable vfith the notches of said bar and pivoted upon said lever, and independent vieldable means controllingl the engagement bt said pavvls ivith slid notches and controlled by said moving paivl.

Ll. In jacl. the combination With a notched lifting bar, of a moving paWl enl v-:ithW the notches in said lifting bar pivoted upon said pavrl, a ing to relatively rotate said rock cam, means at opposite ends ci said roely oar engageable with said cam,

means for nioving Said pawl with its rock bar to force said means oi opposite ends 0i said roel; bar separately into contact with said cam Y.For respectively engaging and disengaging said pawl with and from the notches.

In a jack, the combination with a notched lifting bar, oi a pavvl engageable with the notches in said lifting bar, a rock member carried by said paxvl, a spring between said pavfl and rock member for normally rotating said pawl relative to Said rock memberl to engage one of the notches when one end of said rock member is fulcrumed, aA d means for fulcruming the opposite end of said rock member and remov= ing said one end from its fulcrum whereby said spring` Will rotate said pawl relative to said rock member to disengage from its notch.

G. In a jack, the combination with a notched lifting bar, ot' holding and moving pawls adapted to engage the notches in said bar. a lever for operating said pa-Wls, and yieldable means for automatically engaging said payvls with the notches in said lifting bar, said means controlled solely by the rotatable position of said lever.

7. ln a jack, the combination with a notched lifting bar, of paWls engageable .vith the notches in said lifting bar, rock members pivotally mounted upon said pavvls. springs between the respective pawls and rock members tending to relatively rotate said rock members and paivls, a cam, means ttor moving one of said paWls with its rock member to force one end of said rock member into contact with said cam for engaging said pawl with one of the notches in said lifting bar. said rock member upon said moved pavvl adapted to Contact With said rock member upon said other pawl to release said other pavvl from its notch in the lifting bar.

8. ln a iack, the combination with a lifting bar, of a lever movable through diiierent arcs for respectively raising and lowering said lil-'ting bar. and a handle engageable with said lever tor moving the same through said different arcs, the tree end of' said handle movable through substantially the same arc.

9. ln a ack, the combination with a standard. ot a notched lifting bar slidably engagcable therewith. a lever pivoted in said stan( ard. movable through adjacent arcs for raising` and lowering said li'lting bar, a pawl upon said lever and engageable With the notches in said lifting bar. and yieldable means carried by said paivl for controlling the position of said paivl when engaging said notched lifting bar. said yieldable means being Adependent upon the angular position of said lever. Y

10. In a jack the combination with a Standard, of a, notched lifting Vloer sldably engegeeble therewith, :L lever pivo'tecl in said standard, movable through adjacent ares for raising and lowering said lifting bar, a pewl upon said lever` and engageeble with the notches in seid lifting loer, yieldahle Ineens carried by said pevvl for ejeetng common point between the raising and low- 10 ering eros.

In testimony whereof I affix Iny signature.

SAMUEL HERBERT LANYON. 

